/Engine/Plugins/Animation/IKRig/Source/IKRigEditor/Public/RigEditor/IKRigController.h
Get the name of the retarget chain that contains the given Bone. Returns NAME_None if Bone not in a Chain.
[FName](API\Runtime\Core\UObject\FName) GetRetargetChainFromBone ( const [FName](API\Runtime\Core\UObject\FName) BoneName, const [FIKRigSkeleton](API\Plugins\IKRig\Rig\FIKRigSkeleton) * OptionalSkeleton ) const